Surface Area Prism Calculator: solve surface area prism problems step-by-step. Clear formula, worked example, and FAQs included.
Rectangle: A = length × width. Square: A = side².
Circle: A = π × radius² ≈ 3.14159 × r². Ellipse: A = π × a × b (semi-major × semi-minor axis).
Triangle: A = ½ × base × height. Alternative (Heron's formula): A = √[s(s−a)(s−b)(s−c)] where s = (a+b+c)/2.
Trapezoid: A = ½ × (a + b) × height, where a and b are the parallel sides.
Worked example: an L-shaped room. Split into two rectangles: 4m × 5m = 20m² and 3m × 2m = 6m². Total = 26m². For flooring with 10% waste: 26 × 1.10 = 28.6m² to order.